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Electron Density Measurement of DC Positive Arc Propagating Over an Ice Surface Based on \hbox {H}_{\alpha } Line

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2 Author(s)
Azam Nekahi ; Industrial Chair on Atmospheric Icing of Power Network Equipment (CIGELE) and Canada Research Chair on Atmospheric Icing Engineering of Power Networks (INGIVRE) Pavillon de recherche sur le givrage, Université du Québec à Chicoutimi, Chicoutimi, Canada ; Masoud Farzaneh

Results of spectroscopic investigation of an arc formed over an ice surface are presented. Direct-current positive voltage is applied to a flat ice surface with a 6-cm air gap to initiate electric discharge. Time-resolved spectra are taken during the propagation of arc along the surface. From the emission spectra, the profile of hydrogen-alpha from Blamer series is used to measure the electron density of the arc column. A method based on broadening of the Hα line considering instrumentation broadening is employed. The electron densities obtained by optical emission spectroscopy show an increase from 1 to 2 × 1017 cm-3 corresponding to current increase from 200 to 700 mA. The electron density at the flashover instant is calculated to be about 2.5 × 1017 cm-3.

Published in:

IEEE Transactions on Plasma Science  (Volume:39 ,  Issue: 4 )